A golf club head structure includes a body portion, a hitting plate portion, and a club body combining portion. The body portion has a first junction surface forming a first hook angle therewith. The hitting plate portion has a hitting surface and a second junction surface with a buffer region spaced there-between. The second junction surface forms a second hook angle with the hitting plate portion, and butts against and attaches to the first junction surface on the same plane. The club body combining portion is provided for combining a club body. Therefore, a joint structure with a junction portion as a plane, capable of not being located on the surface of the club head and spaced by a buffer region with the hitting surface, is formed, which is applicable for solving the combination problem of the junction surface on the same plane that the casting is deformed.